. >>> coming up on "this week" as the flawed rollout of the affordable care act place the obama administration, george stephanopoulos goes one-on-one with white house senior advisor dan phifer. along with the issues surrounding healthcare.gov, phifer will also discuss the continued fallout over the lateddest revelations of nsa spying. you can catch it right here on abc7 at 8:00. >>> more than a year after 17-year-old trayvon martin was fatally shot by neighborhood watch volunteer george zimmerman, the city where it happened, sanford, florida, is rolling out a revamped neighborhood watch program. the sanford police department will outline the changes tuesday during a community meeting. revisions include restricting volunteers from carrying firearms, and from pursuing suspects. zimmerman was acquitted of a second degree murder charge back in july. >>> the cal palace in daly city is expected to be packed again today with people attending one of the country's biggest gun shows. it's sponsored by the crossroads of the west. organizers say they do everything by the book and gun owners appreciate it.